Tire Pressure - 305/70's - Please

[Joe Mc]

I've been searching for hours to no avail - can someone tell me what they have been running with their 305/70/16's specifically front# & rear# - I'm on stock chrome wheels. Max sidewall on the Cooper Discovery's states 50 psi - I had the old 265's dialed @ 65f & 55r I'm running 50# in all 4 for now and am concerend going higher/lower.



Real experience and other comments appreciated.

 

[Rob Thomas]

I think I'd stick to the specs on the tire, the tire company would know, I run 50psi in my 315's, however they're not coopers.



Just my . 02



Later, Rob

 

[fest3er]

Originally posted by Joe Mc
I've been searching for hours to no avail - can someone tell me what they have been running with their 305/70/16's specifically front# & rear# - I'm on stock chrome wheels. Max sidewall on the Cooper Discovery's states 50 psi - I had the old 265's dialed @ 65f & 55r I'm running 50# in all 4 for now and am concerend going higher/lower.

Real experience and other comments appreciated.

Search for 'powder' and 'contact'. There have been threads about this topic. The basic concept is to sprinkle white powder on black paper, then drive your wheel across the paper. This will give you a good idea how the tread is contacting the pavement.

Alternately, you could draw some lines across the tread with a stick of chalk and drive them a turn or three. This should get you in the ballpark, at least.

In essence, you want the tread to contact the pavement smoothly across the width of the tire. If you can see a gap under the outer edge of the tread, you *definitely* have too much air in them! If you can see a gap under the middle, then you've not enough air.

Aren't 305's a *tad* wide for stock wheels?

Fest3er

 

[HeberRam]

fest... I tried all combinations, and this works the best for me on an "unloaded" truck 42psi in the front 32psi in the rear... . rotate every 5000 miles or sooner.



Steve

 

[Vaughn MacKenzie]

305s on stock steel rims?



Big Bob ran 295 Coopers on his stock steel rims and they wore out really fast. Since they crowned so much due to the very narrow rims he had to drop the pressure and run them only around 35 psi. Riding in his truck they seemed to be pretty soft at that pressure and they looked pretty squished out where they made contact with the road. I think they were worn out by 18,000 miles. He has since gone with a 9" wide rim I believe to alleviate this problem.

 

[nfox]

tire pressure

I have 305 at-s on my stock chrome wheels and i run 35psi in the front tires and 40psi in the rear with no problems, just my $5. 00 worth. Oo.

 

[Joe Mc]

Thanks for the replies and suggestions. I'm going to try 45f & 30-35r, at least for a place to start. Thanks again.



fest3er - I totally forgot about the chaulk trick - pretty clever huh?



Later